Deutsche Bank, indicted for colluding with Banca Monte dei Paschi di Siena SpA to conceal the Italian lender’s losses, mismarked the transaction and dozens of others on its own books, according to an audit commissioned by Germany’s regulator.

Banca Monte dei Paschi di Siena SpA’s largest shareholder has decided to sue two of the Italian bank’s former managers including ex chairman Giuseppe Mussari as well as Nomura and Deutsche Bank over the alleged use of derivatives to mask losses.

Three former executives of Banca Monte dei Paschi di Siena SpA face an expedited trial for allegedly obstructing regulators in the first indictments related to the managers’ use of derivatives to mask losses.

Italy’s central bank is fining former top executives of Banca Monte dei Paschi di Siena SpA about $6.4m for their alleged lack of controls over the lender’s risk management, said a person with knowledge of the matter.

Deutsche Bank and Banca Monte dei Paschi di Siena SpA were criticized by European Union lawmakers for entering into a derivative that obscured losses at the world’s oldest lender before it sought a taxpayer bailout.